下列(    )曲线是真空的弧隙介质强度恢复曲线。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69524' and id < 4504235 and id<>'4504235' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69524' and id > 4504235 and id<>'4504235' order by id asc limit 5